• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Elucidation of the mechanism of rupture of intracranial aneurysm

Research Project

Project/Area Number 20K17929
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 56010:Neurosurgery-related
Research InstitutionShiga University of Medical Science

Principal Investigator

Miyata Haruka  滋賀医科大学, 医学部, 客員助教 (40869749)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsintracranial aneurysm / rupture / 脳動脈瘤 / 破裂機序 / 慢性炎症 / 動物モデル
Outline of Research at the Start

脳動脈瘤の発生や増大はマクロファージ依存的な慢性炎症により制御されていることはよく知られているが、脳動脈瘤の破裂には脳血管の器質的変化と炎症反応が重要であることが最近の我々の研究から示された (Miyata. J Neurosurg. 2019)。しかしながら、生じうる器質的変化の誘因や破裂に繋がりうる炎症反応の詳細な機構については未解明である。脳動脈瘤が安定した状態を維持する、あるいは破裂に至る変化を生じる機構を解明することは、脳動脈瘤破裂を制御する治療法の開発につながりうる。脳血管壁の器質的変化および破裂と関連する炎症反応の解析を行うことで、脳動脈瘤の破裂を制御する機構を解明する。

Outline of Final Research Achievements

Comprehensive gene expression analysis of the wall of intracranial aneurysms in model animals suggested the involvement of neutrophils in aneurysmal rupture. Spontaneous rupture of intracranial aneurysms was also significantly increased when neutrophil infiltration of the lesion was increased by G-CSF administration to the model animals. In ruptured aneurysm specimens, neutrophil infiltration was predominantly near the vasa vasorum of the wall, and in vivo detection of tissue hypoxia using Hypoxyprobe confirmed the presence of hypoxia in the outer membrane of cerebral aneurysms. Immunostaining showed the expression of FGF2 and VEGF in the same region. We hypothesized that hypoxic stimulation of the aneurysmal adventitia induces FGF2 and VEGF, which in turn induce vasa vasorum growth in the adventitia and rupture of the infiltrated neutrophils.

Academic Significance and Societal Importance of the Research Achievements

脳動脈瘤の破裂機序はこれまでほぼ解明されておらず、未破裂脳動脈瘤に対しての治療介入は外科治療しか選択肢が存在せず、内科治療の創出がunmet medical needとなっている。一方、破裂機序が解明されれば、脳動脈瘤破裂予防に対する薬物治療を創出しうる可能性がある。本研究で明らかになった好中球などの炎症を脳動脈瘤壁局所で制御できれば、脳動脈瘤破裂を予防できる可能性があり、社会的意義があるものと考えられる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (2 results)

All 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Involvement of neutrophils in machineries underlying the rupture of intracranial aneurysms2020

    • Author(s)
      Kushamae M, Miyata H, Shirai M, Shimizu K, Oka M, Koseki H, Abekura Y, Ono I, Nozaki K, Mizutani T, Aoki T
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 20004-20004

    • DOI

      10.1038/s41598-020-74594-9

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Neutrophils Infiltrating Through Vasa Vasorum Facilitate Rupture Of Intracranial Aneurysms2020

    • Author(s)
      Mika Kushamae , Tomohiro Aoki , Haruka Miyata , Kazuhiko Nozaki , Tohru Mizutani
    • Organizer
      International Stroke Conference 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2020-04-28   Modified: 2024-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi